 Movement is meaningful and motivated  Movement is best understood by looking at the interaction of the person, task and environment  Movement is guided by both internal and external environments  All nervous system components influence movement

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Includes: ◦ Muscle spasms: sudden, involuntary contractions of the muscles ◦ Cramps: severe and painful spasms ◦ Fasciculations: twitches of the muscle fibers of a single motor unit visible on the surface of the skin ◦ Myoclonus: brief contractions of a muscle or group

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